How sad for you and I'm very, very sorry. I would be devasted becuase my hens are pets too. However, I would just hope these people did this only because they were hungry and desperate for food, not out of meanness. That said, I would definately get motion cameras set up, a sign letting people know you are armed, (I saw one the other day that said, "I have nothing on my property that is worth dying for, with a target as the background) and let all the neighbors know what happened and that you will offer a reward. You might be surprised what you find out. If you have one of those outdoor flea markets, I would visit that to see if anyone is trying to sell your chickens. Again, I'm so sorry!